92 FLORIDA GEOLOGICAL SURVEY-NINTH ANNUAL REPORT. 
3.6 inches; June, 6.8 inches; July, 8 inches; August, 7.1 inches; 
September, 5.1 inches; October, 3.7 inches; November, 2.9 inches; 
December, 4.1 inches. 
VEGETATION 
The rolling uplands of the northern part of this area, although 
largely cleared at the present time, supported originally a mixed 
timber growth, including short-leaf pine and many hard-wood 
deciduous trees, such as red-oak, hickory, dog-wood, magnolia and 
live-oak. The chief timber growth of the level lands, particularly 
in the southern part of the area, is long-leaf pine. In the flat-woods 
the undergrowth associated with this pine is chiefly saw-palmetto, 
while in the well drained land the palmetto is wanting. The lime¬ 
stone belt of Wakulla County includes a considerable area of ham¬ 
mock land supporting a mixed largely deciduous timber growth. 
When studied in detail the vegetation of this area may be 
divided into several more or less well-marked vegetation types, and 
in his report on the vegetation of Northern Florida, published in the 
sixth annual report of this Survey, Dr. R. M. Harper has indicated 
eight vegetation types within this area. The plants characterizing, 
each type are there listed. 
ELEVATIONS 
The only precise levels available in this area are bench marks 
established by the U. S. Coast and Geodetic Survey and by the U. S. 
Geological Survey. These are placed at intervals across the area 
from east to west following the line of the Seaboard Air Line Rail¬ 
way, and from Tallahassee northwest following the Georgia, Florida 
and Alabama Railway. In addition to these precise levels, lines of 
levels have been made recently along some of the public roads, either 
by the State, through the Department of Roads, or by the County, 
through the County Engineers. The profiles and levels of railroads 
have also been available in determining elevations. Where no 
other levels were available the anaeroid barometer has been used to 
some extent, especially a number of readings checked by barograph 
made during the summer of 1917 by Dr. Oliver B. Hopkins. The 
levels on the public roads in Leon County were made in part during 
1916 by, or under the direction of Mr. J. W. Jones, then County 
Engineer, and in part during 1916 and 1917 by, or under the direc- 
